Water heater



' Feb. 24, 1925.

W. COLEBROOK WATER HEATER Filed sept. 7, 1923 m m e@ z l .W .M d t n .i j M, W E f JJ A fj, i m Y i w// .////\/wM/%Q Patented Feb. 24, 1925.

UNITED STATES PATENT DFFCE.

WILLIAM COLEBROOII, DECEASED, LATE OF DURBAN, NATAL, SOUTH AFRICA; BY HILDER :MARY MAY COL'EERODK, OF HARRINGAY, AND LUCY .ANNE NEALE, OF

GRANTHADI, ENGLAND, EXECUTRIXES.

WATER HEATER'.

Application le. September To aZZ whom t may concern: y

Be it known that WILLIAM GoLEBRooK, late a subject of the King of Great Britain and Ireland, but new deceased, and a resident of Durban, Natal, South Africa, did during his lifetime invent a certain new and useful Improvement in Viater Heaters, of which the following is a specification.

This invention relates to apparatus for heating water by electricity, of the type in which the elect-ric current is passed through a resistance tape coiled outside of a metal cylinder whose inner surface is in contact with the water to be heated.

y The object of the invention is te provide a simple and cheap construction which shall not readily get out of order.

The invention comprises an iron or other suitable cylinder closed and outwardly flanged at each end and coated on its outer surface with vitreous enamel. On the vitreous enamel is wound a spiral of resistance tape, the ends of which are bound to the cylinder by circular bands connected to suitable terminals. Over the tape is applied a layer of mica which is tightly held in place by armouring of suitable inetal (preferably copper) wire, and the whole is enclosed in an outer shell-like cylinder which is secured to the flanges and spaced awa-y from the resistance element. Within this space may be placed a layer of suitable heat-insulating material. The water to be heated passes through the interior of the iron or the like cylinder. An inner cylinder may be provided between which and the former the water may be caused to travel in a hollow cylindrical path.

In cases where the water is passed through the heater from a circulating tank for the purpose of heating water in bulk, and in other cases under certain conditions I prefer to dispense with the inner cylinder.

Practical modes of carrying out the invention, showing preferred constructional features, are hereinafter described with reference to the accompanying drawings, wherein Figure l is a sectional elevation of one form of apparatus.

Figure 2 is an exterior view 0f a form modified so far as the outside electrical con nections are concerned.

Referring to the drawings, a is the main 7, 1823. Serial No. 661,533.

cylinder of the apparatus, which is of metal, and electrically insulated by a coating of vitreous enamel on the exterior, the interior also being enamelled to protect the iron cylinder. This enamel Z) is represented by the double line shown in the drawings. The resistance tape c is applied over the enamel and there is a soft metal wire armouring wound round with an intervening` mica insulation. In the view according to Figure l, the leads Z trom such resistance winding (suitably beaded or otherwise insulated) are led to a terminal boXc. In Figure 2 I show an alternative arrangement of leads which are taken to the recessed back of a baseboard and wired so that the switch g acts as a local current cut-off at the apparatus, whilst connection with a source of power is made through the plug socket ZL. Also, in said Figure 2 c' represents a water inlet control valve. In connection with the switches and water valve, I wish it to be understood that any suitable interworking device may be incorporated so that the water valve cannot be closed without switching off the current.

The main cylinder a is formed integrally with end flanges y', and both ends are closed, one end by a detachable cover plate 7c. Such closed ends have central apertures to provide a water passage at Z and m. An outer shell-like cylinder n surrounds the main cylinder and its windings, and the assembly is mounted by brackets o to a. baseboard f.

In the sectional view, Figure l, I have shown a form of apparatus where the water enters at Z and travels in hollow cylindrical fashion to the outlet for het water at m. The Water passage is formed by an interior closed cylinder 7) spaced away from the main cylinder Z by studs Q, and having castellated ends r which space and position it longitudinally in the apparatus.

I claim:

l. A water heater of the class described comprising a main cylinder having offset flanges at opposite sides thereof and closed at one end, a water inlet at the closed end, a cap for the open end, a hollow closed cylinder having castella-ted end ,portions fitting within the main cylinder and providing a relatively constricted annular water passage between the outside of the interior closed cylinder and the inside wall of the main cylindei, a. Water outlet communicating With the chamber formed by one of the caste-Hated ends of the closed innei' cylinder, electrical heating Wires carried by the outside of jdie saidniain cylinder, and a protecting shell engaging with the flanges of said main cylinder.

2. A Water heater of the class described coinpising a inain cylindei1 closed at one end and having offset flanges at opposite ends thereof, electrical heating means surrounding` the outside of' said main cylinder, a Water inlet for the closed end of the cylinder, a. cap for the upper end of' said cylinder and having the Water outlet connection, ineans 15 Within the main cylinder forming a` relatively consti'icted Water passage, brackets for engaging with the liange portions of' the main casing foi supporting the device, and an encasing shell also engaging With said flanges.

In testimony whereof We have affixed oui signatures hereto.

HlLDER MARY MAY COLEBROOK, LUCY ANNE NEALE, Eeciltrz'cs of flic Last Will and Testa/ment of William Coleluook, Deceased. 

